2007
May 8, 2007
Minebea Co., Ltd.
Development of DC brush motor [S Series] with double the torque relative to motor cubic content
Minebea-Matsushita Motor Corporation (hereinafter referred to as MMMC), a joint venture of Minebea Co., Ltd. and the Motor Company of Matsushita Electric Industrial Co., Ltd., has developed a rounded-edge, high-performance DC brush motor (S Series) that has over twice the torque relative to cubic content compared with previous motors. Through the placement of proprietary high-performance magnets, employment of a new 4-pole 6-slot design and development of a unique metal brush, MMMC has achieved over twice the torque of previous motors. At the same time, MMMC has succeeded in increasing DC lifespan dramatically (over 500% compared with previous MMMC models).
[Product aims]
Recently, the number of DC brush motors used in devices, from game machines to OA and AV equipment, home appliances, and automobiles, has been greatly increasing. Not only must the motors be compact, lightweight and low noise, but the devices in which they are installed must be more compact, have lower noise and be highly reliable. This new S Series utilizing its high torque and long lifespan greatly simplifies gearless motors and mechanics, allowing device units to be more compact and reliable.
With the development and sales of the S Series, MMMC aims to expand its sales share primarily in automotive, OA, home appliances, and its presence in new markets.
DC brush motors generally have magnets located outside of the rotors, so the rotor diameter cannot be too large with respect to the size of the motor itself, which limited the amount of torque that could be produced relative to the motor's cubic content. Due to the S Series' unique rounded-edge design, magnets can be placed in the small spaces at the four corners, allowing the diameter of the rotor to be large.
The motor has been designed with a structure that fully utilizes the rotor's external diameter and effective maximization of the magnet cubic content in mind, and high-performance magnet manufacturing technology has been combined with proven DC brush contact point technology and magnetic circuit design techniques, to develop a DC brush motor with double the torque relative to motor cubic content compared with existing motors.
A standard sample with a supported size of 
6*10mm-34*50mm DC12, 24V, will be available from May 2007. The price starts from 5000 yen per unit. Options such as gears and encoders will also be available.
This DC brush motor was developed comprehensively with our proprietary magnetic material manufacturing technology and DC brush motor technology, and will go into mass production at Minebea Electronics Motor (Malaysia) Sdn. Bhd. from December 2007.
New product features
A summary of this product's features is shown below.
(1) New design in which magnets are placed in the four corners achieves double the torque relative to cubic content compared with our existing products.
(2) It has 4-poles 6-slots, and utilizes magnetic field analysis to achieve low cogging and low noise by increasing the number of cogging peaks from 12 to 24.
(3) Our proprietary rounded-edge design increases freedom during installation.
(4) Long life achieved by employing a newly developed metal brush.
| Reference Specifications |
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| S Series Motor SE15K |
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| Motor performance comparison chart (S-T, I-T characteristic table (reference)) |
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| Enhanced performance in S Series motors |
For inquiries, please contact:
Minebea Co., Ltd.
Masaki Ishikawa
Corporate Communications Office
Corporate Planning Department
ARCO Tower, 19th Floor,
1-8-1, Shimo-Meguro, Meguro-ku, Tokyo 153-8662
Tel : 81-3-5434-8637 / Fax : 81-3-5434-8607
E-Mail : mishikaw@minebea.co.jp
URL : http://www.minebea.co.jp/
Product information, contact and other context are subject to change without prior notice.
